ECMAScript Documentation The ECMA-262 standard is the official documentation for the ECMAScript language. Editions 3.1 and 4 ("Harmony") ECMA-262 Editions 3.1 and 4 are the next-generation versions of ECMAScript being developed currently by the ECMA TC39 committee. The committee maintains a documentation wiki, which is publicly accessible. Older documents Read the tutorial on evolutionary programm